Exhaust emission control filter and method of controlling exhaust emission
a technology of exhaust emission control and filter, which is applied in the direction of electrical control, machine/engine, separation process, etc., can solve the problems of exhaust of collected hydrocarbon compounds and collected carbon-containing particulates, and achieve the effects of preventing heat from being released, large dynamic pressure, and effectively raising the filter temperatur
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first modified example
(1) First Modified Example
[0177]FIG. 22(a) shows an attachment structure of a first modified example. In the first modified example, a projection 126 is formed on the inner circumferential face of the filter holder 40 at a position corresponding to the inlet to the gap 124. The projection 126 formed on the inner circumferential face of the filter holder 40 intercepts the flow of the exhaust gas and prevents the direct flow of the exhaust gas into the gap 124. The arrangement thus restricts the flow of the exhaust gas inside the gap 124. This decreases the quantity of heat transmission to the filter holder 40 and thereby keeps the particulate filter 100 at sufficiently high temperature.
second modified example
(2) Second Modified Example
[0178]FIG. 22(b) shows an attachment structure of a second modified example. In the second modified example, a step is formed on the inner circumferential face of the filter holder 40 to interfere with the direct flow of the exhaust gas into the gap 124. This arrangement thus restricts the flow of the exhaust gas inside the gap 124.
[0179]In the second modified example, the step formed on the inner circumferential face of the filter holder 40 is close to the end of the particulate filter 100. A restriction 128 is accordingly provided between the end of the filter and the step. The restriction 128 functions to interfere with the inflow of the exhaust gas and restricts the flow of the exhaust gas inside the gap 124. This decreases the quantity of heat transmission to the filter holder 40 and thereby keeps the particulate filter 100 at sufficiently high temperature.
third modified example
(3) Third Modified Example
[0180]FIG. 22(c) shows an attachment structure of a third modified example. In the third modified example, a heat insulating member 130 is set on the outer circumference at the end of the particulate filter 100. The gap 124 is defined behind the heat insulating member 130 in attachment of the particulate filter 100. In the attachment structure of the third modified example, the heat insulating member 130 intercepts the flow of the exhaust gas into the gap 124 and thus keeps the particulate filter 100 at high temperature.
[0181]In the structure of the third modified example, the heat insulating member 130 guides the particulate filter 100 and keeps the particulate filter 100 apart from the filter holder 40 at a fixed interval. This advantageously facilitates attachment of the filter.
[0182]In the structure of the third modified example, the heat insulating member 130 is disposed only on the outer circumference at the end of the particulate filter 100. The heat...
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